The Complete Guide to Safran Engine Parts, Modules, and Accessories for Airbus Helicopters

In the demanding world of rotorcraft maintenance and operation, Safran engine parts are at the heart of performance, reliability, and mission readiness. Whether you operate an Airbus H125, AS350 B2/B3, or EC130 T2, understanding how Safran modules and accessories work—and when to service or replace them—is crucial for reducing downtime and increasing flight safety.



As an FAA-certified Part 145 Repair Station (LVBR789X) based in Boulder City, Nevada, Black Mountain Aviation provides industry-grade inspection, replacement, and exchange services for a wide range of Safran engine components. This guide is built for helicopter operators, maintenance professionals, and fleet managers who want to get the most out of their Safran-powered Airbus helicopters.

What Makes Safran Engines the Gold Standard?

Safran Helicopter Engines, particularly the Arriel family, are among the most trusted turbine powerplants in the world. The Arriel 1D1, 2B, 2B1, and 2D are all workhorses in commercial, public safety, tourism, and utility helicopter missions. Their modular architecture and serviceability make them efficient to inspect, repair, and overhaul—provided you follow OEM guidelines and partner with a certified repair station.

Key Safran Engine Parts & Components

1. Safran Arriel Engine Modules

Each Safran Arriel engine is made up of five key modules:

• Module 1 (Axial Compressor & Accessory Gearbox) – P/N: 70BM015420
  
  
• Module 2 (Centrifugal Compressor) – P/N: 70BM025020
  
  
• Module 3 (Gas Generator Turbine) – P/N: 70BM035420
  
  
• Module 4 (Power Turbine) – P/N: 70BM045410
  
  
• Module 5 (Reduction Gearbox) – P/N: 70BM055420
  
  

Each module has a distinct overhaul interval and must be tracked individually according to Safran's Component Maintenance Manual (CMM) and your aircraft’s service logs.

2. Free Wheel Shaft Assemblies

This component enables autorotation by preventing engine torque from being transferred back to the powertrain in the event of engine failure.

• 1D1 Freewheel Shaft – P/N: 0292907680
  
  
• 2B Freewheel Shaft – P/N: 0292900020
  
  

These are typically replaced based on condition and cycle count, not just hours.

3. Fuel Control Units (FCU) and Pump & Metering Valves

These regulate the fuel flow from tank to turbine and are often known by alternate names such as HMU (Hydromechanical Units).

• 1D1 FCU – P/N: 0164851320
  
  
• 2B HMU – P/N: 0292861650
  
  
• 2B1 HMU – P/N: 0292862620
  
  

Contaminated fuel or excessive heat cycles can cause premature wear, making regular inspection a must.

4. Drain Valves (Start and Overspeed)

Essential for proper lubrication and start-up sequences.

• Start Drain Valve – P/N: 0174078030
  
  
• Overspeed Drain Valve – P/N: 0174120180
  
  

Any irregularities in startup or shutdown behavior may be linked to these small but critical parts.

Accessories & Structural Components You Shouldn't Overlook

Besides engine modules, Black Mountain Aviation supports Safran accessories and supporting parts for Airbus helicopters, including:

• Tail Rotor Spider (Pitch Change Unit)
  Part Numbers: 350A33-2030-00, 350A33-2167-00, 350A33-2167-01
  
  
• Swashplates
  Part Numbers: 350A37-1004-08 through -11
  
  
• Crossbeams (Dogbones)
  Part Numbers: 350A38-0211-00 through -02
  
  
• Anti-Vibrators (AVA)
  Part Numbers: 350A31-0033-01 through -06
  
  

These parts directly affect rotor balance, vibration damping, and flight control—making them essential for both performance and pilot comfort.

Common Aircraft We Service

We support a wide variety of Airbus rotorcraft models, including:

• Airbus H125 (AS350 B3)
  
  
• Eurocopter AS350 B2
  
  
• EC130 B4 and EC130 T2
  
  

All of these rely on Safran Arriel powerplants, and each has model-specific inspection intervals. At Black Mountain Aviation, we maintain certified parts and perform condition-based assessments to recommend repairs or replacements tailored to your flight hours, usage type, and climate conditions.

Understanding Replacement Cycles

OEM Replacement Guidelines (Typical Intervals)

Component: Module 1–5

Hours: 2,000–4,000

Cycles: Yes

Condition-Based?: Yes

Component: Freewheel Shaft

Hours: -

Cycles: 2,000–3,000

Condition-Based?: Yes

Component: FCU / HMU

Hours: 1,000–1,500

Cycles: -

Condition-Based?: Yes

Component: Drain Valves

Hours: 1,200

Cycles: -

Condition-Based?: Yes

Component: AVA / Spider / Crossbeam

Hours: 1,000–2,000

Cycles: Yes

Condition-Based?: Yes

Following OEM timelines is essential, but even more critical is real-world evaluation by certified mechanics who know how to detect subtle signs of fatigue, wear, or environmental impact.

Signs It's Time to Replace or Inspect Your Safran Parts

1. Startup Lag or Unstable RPMs
   
   
2. Unusual Vibrations or Noise from Rear Airframe
   
   
3. Fluctuating EGT or N1 Spikes
   
   
4. Oil Leaks or Metal Particles During Chip Checks
   
   
5. Higher-than-normal fuel consumption
   
   

Don’t wait for a warning light or fault code—catching problems early protects the engine core, reduces downtime, and lowers total cost of ownership.

Component Overhaul Exchange Services

Black Mountain Aviation offers Component Overhaul Exchange programs to help operators swap time-expired or worn Safran engine modules and accessories quickly and efficiently. Every part is:

• FAA certified with 8130-3 tags
  
  
• Tested and serialized
  
  
• Compliant with Arriel and Airbus OEM specs
  
  

This service helps you get back in the air faster—without waiting weeks for OEM turnarounds.

Why Choose Black Mountain Aviation?

• FAA Part 145 Certified Repair Station
  
  
• Located at Boulder City Municipal Airport (KBVU)
  
  
• Decades of Safran/Arriel Experience
  
  
• Inventory On-Hand for Exchange
  
  
• Field Support Across Nevada & Southwest
  
  
• Specialists in Airbus H125, AS350, EC130 Platforms
  
  

Our technicians are factory-trained, and our operation is built around fast turnarounds, traceability, and the safety standards you expect in mission-critical environments.

Schedule Your Next Safran Engine Inspection

Need support with your Safran Arriel 1D1, 2B, or 2D components? Whether it's diagnostics, replacement, or exchange, Black Mountain Aviation is your trusted partner.

Call (702) 294-1044
Visit: www.bmaviation.net
1411 Airport Rd, Suite 100, Boulder City, NV 89005